期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 60, 期 13, 页码 2985-2992出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2004.02.012
关键词
chlorobenzylidine; calf thymus DNA; circular dichroism; nuclear magnetic resonance
类别
The binding of chlorobenzylidine to calf thymus DNA has been studied in detail by means of circular dichroism, (CD), nuclear magnetic resonance (H-1 NMR), viscosimetry and denaturation temperature (T.). Chlorobenzylidine is found to intercalate between base pairs of DNA as evidence by: (1) induced circular dichroism; (2) broadened H-1 NMR signals; (3) enhanced viscosity; and (4) increased denaturation temperature of the DNA helix. In addition, Scatchard plot from CD titration data gives a binding constant of 2.6 x 10(4) M-1 and a binding site size of 4 base pairs at 25degreesC. Matrix rank analysis shows that there are three main components contributing to the observed CD spectra. The nuclear magnetic resonance experiment shows that the planar aromatic ring of tetrahydroberberine group in chlorobenzylidine intercalates between the base pairs of DNA when chlorobenzylidine is bound to DNA. (C) 2004 Published by Elsevier B.V.
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